cc: Enable GL_RED_EXT for YUV resources

cc/resources/resource_provider.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resources/resource_provider.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/containers/hash_tables.h"
@@ skipping 1201 matching lines @@
       blocking_main_thread_task_runner_(blocking_main_thread_task_runner),
       lost_output_surface_(false),
       highp_threshold_min_(highp_threshold_min),
       next_id_(1),
       next_child_(1),
       default_resource_type_(InvalidType),
       use_texture_storage_ext_(false),
       use_texture_format_bgra_(false),
       use_texture_usage_hint_(false),
       use_compressed_texture_etc1_(false),
+      yuv_resource_format_(LUMINANCE_8),
       max_texture_size_(0),
       best_texture_format_(RGBA_8888),
       use_rgba_4444_texture_format_(use_rgba_4444_texture_format),
       id_allocation_chunk_size_(id_allocation_chunk_size),
       use_sync_query_(false) {
   DCHECK(output_surface_->HasClient());
   DCHECK(id_allocation_chunk_size_);
 }
 
 void ResourceProvider::InitializeSoftware() {
@@ skipping 18 matching lines @@
   default_resource_type_ = GLTexture;
 
   const ContextProvider::Capabilities& caps =
       output_surface_->context_provider()->ContextCapabilities();
 
   bool use_bgra = caps.gpu.texture_format_bgra8888;
   use_texture_storage_ext_ = caps.gpu.texture_storage;
   use_texture_format_bgra_ = caps.gpu.texture_format_bgra8888;
   use_texture_usage_hint_ = caps.gpu.texture_usage;
   use_compressed_texture_etc1_ = caps.gpu.texture_format_etc1;
+  yuv_resource_format_ = caps.gpu.texture_rg ? RED_8 : LUMINANCE_8;
   use_sync_query_ = caps.gpu.sync_query;
 
   GLES2Interface* gl = ContextGL();
   DCHECK(gl);
 
   texture_uploader_ = TextureUploader::Create(gl);
   max_texture_size_ = 0;  // Context expects cleared value.
   GLC(gl, gl->GetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size_));
   best_texture_format_ = PlatformColor::BestTextureFormat(use_bgra);
 
@@ skipping 887 matching lines @@
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->ContextGL() : NULL;
 }
 
 class GrContext* ResourceProvider::GrContext() const {
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->GrContext() : NULL;
 }
 
 }  // namespace cc